POPULATION DYNAMICS OF LEPTINOTARSA DECEMLINEATA (SAY) IN EASTERN ONTARIO: III. MAJOR POPULATION PROCESSES
- 1 July 1971
- journal article
- Published by Cambridge University Press (CUP) in The Canadian Entomologist
- Vol. 103 (7) , 1049-1061
- https://doi.org/10.4039/ent1031049-7
Abstract
An appraisal of population processes in the Colorado potato beetle, Leptinotarsa decemlineata (Say), on its principal host plant showed that the insect has no natural agents that act in a manner that prevent it from overshooting its food supply. It is little affected by weather conditions or predators, and its only parasite, the tachinid Doryphorophaga doryphorae (Riley), is inversely density dependent in its action. Once the beetle has exploited its food resource, the larvae starve and the adults emigrate in quest of other hosts.The analysis of age interval survivals showed that populations are both regulated and disturbed by the principal key factor, adult migration, which is density dependent but overcompensating. A predictive model based on density relationships explained 94% of the variance in population trend.Keywords
This publication has 17 references indexed in Scilit:
- The Detection of Regulation in Animal PopulationsEcology, 1970
- The Regression of Log N(n+1) On Log N(n) as a Test of Density Dependence: An Exercise with Computer‐Constructed Density‐Independent PopulationsEcology, 1970
- Recent Advances in Insect Population DynamicsAnnual Review of Entomology, 1970
- Logarithmic Regression as a Measure of Population Density Response: Comment on a Report by G. W. SaltEcology, 1968
- The Interpretation of Population ChangeJournal of Animal Ecology, 1967
- An examination of Logarithmic Regression as a Measure of Population Density ReponseEcology, 1966
- Population Dynamics of Leptinotarsa decemlineata (Say) in Eastern Ontario: II. Population and mortality estimation during six age intervalsThe Canadian Entomologist, 1964
- Population Dynamics ofLeptinotarsa decemlineata(Say) in Eastern Ontario: I. Spatial Pattern and Transformation of Field CountsThe Canadian Entomologist, 1963
- Mathematical Population Models for Five Agricultural Crop PestsMemoirs of the Entomological Society of Canada, 1963
- Predictive Population Equations Based on Key FactorsMemoirs of the Entomological Society of Canada, 1963